Date: Thu, 26 Nov 1998 20:41:30 -0600 From: Michael Maxwell <drwho@xnet.com> To: freebsd-questions@FreeBSD.ORG Subject: sio overflows... Message-ID: <19981126204130.A620@drwho.xnet.com>
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Ok, this is really getting to be a problem now... When using Zmodem to send a file to a remote system (along with the lsz program), it appears that there is a serious buffer overflow on the serial port. Here's a typical situation: - OS: FreeBSD 2.2.7-STABLE - minicom (with lsz -- version of lsz makes no difference) - modem is internal USR Sportster 33.6. tried initializing port at various speeds, makes no difference. Has a 16550A UART. - minicom is setup to use the callout device /dev/cuaa1 I try to do a Zmodem upload, and the cps rate will shoot up to about 10000 or so, then drop to about 100, then repeat. This will send about 1K worth of the file, then it backs up halfway, then tries again. It will continue to do this until either a) the file finishes, b) I abort the transfer, c) too many errors cause the transfer to abort itself. Most of the time, though not always, I see the following from syslog: Nov 21 00:04:44 drwho /kernel: sio1: 211 more tty-level buffer overflows (total 5293) Note: this ONLY seems to happen when SENDING (not receiving) files using Zmodem. My PPP connection is fine. My Zmodem RECEIVE is fine. This is getting to be a serious problem for me, since I need to upload files using Zmodem from time to time. I know others have complained of this, and I've yet to find an answer from ANYONE. I should point out that this same machine, with the EXACT same hardware, ran Linux 2.0.x for about a year and NEVER had this problem. So I'm convinced that I don't have buggy hardware... If anything, the problem probably concerns /sys/i386/isa/sio.c, but my kernel hacking skills aren't adequate to handle this one. Is anyone working on this? Does anyone have an answer? I'd appreciate whatever help I can get (and I'm sure many others agree). Thanks. -- drwho @ xnet.com, BOFH -- http://www.xnet.com/~drwho/ I'd give my left arm to be ambidextrous. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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